Pop QuizCould You Be in Madonna's Entourage?

Why did she name her daughter Lourdes? What did her infamous belt say? As the Material Mom turns 51, see how well you know the pop icon! By Cara Lynn Shultz

CREDIT: Shavawn Rissman / AP

Published: Tuesday August 11, 2009 06:00 AM EDT

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Why did Madonna name her daughter Lourdes?

To honor her mother
She's always loved the name
She had a dream about the name
It's Madonna's middle name